Both good responses. Tomatoes (generally though this is affected by variety, day length and other factors) need about 1300 growing degree days to ripen:
A GDD is how many degrees the average temp for the day is above 50.
Here's an e.g. from the article:
Example: High temp = 68, low temp = 42
68 + 42 = 110
110/2 = 55
55 Ã¢â‚¬â€œ 50 = 5 GDD
So if your temps were staying as in that e.g. it would take 260 days or more than 8 months to ripen an average tomato!
If you were having highs of 80 and lows of 65 you would have 22 GDD per day and it would take about 60 days/ 2 months to ripen that tomato.
But I also agree with gixx. Chicken manure is very hot, very high nitrogen. Ordinarily you would apply it in the fall and let it break down over winter. And adding Miracle Grow on top of that FOUR times, sounds like way too much nitrogen. All that nitrogen leads to big leafy plants that don't fruit much.
Tomato Tone is an organic fertilizer designed for tomatoes. Its NPK formulation is 4-7-10. So it is definitely higher in PK than Nitrogen.
I have two tomato plants in my front yard, in good rich soil. I added nothing but some compost. Today I just picked off all the full size green- blushed tomatoes off them (so I could pull the plants and put in fall stuff) and that was over 100. So I am thinking over the season,including today's harvest, I have probably gotten 400 full size tomatoes from those two plants.
Sometimes less is more. Sounds like you were trying too hard.